{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "In order to develop new iodinated and fluorinated matched - pair radiotracers for Single - Photon Emission Computed Tomography ( SPECT ) / Positron Emission Tomography ( PET ) imaging and targeted radionuclide therapy of melanoma , we successfully synthesized and radiolabelled with iodine - 125 seven new derivatives , starting from our previously described lead structure 3 ."}
{"Chemical": ["iodine - 125"]}